Jet performance at the Circular electron-positron Collider

TL;DR

This study evaluates jet reconstruction performance at the CEPC, demonstrating high precision in energy and angular measurements, and analyzing the effects of different algorithms and criteria on jet response accuracy.

Contribution

It provides a detailed analysis of jet energy and angular responses using fully simulated samples, including the impact of clustering algorithms and matching criteria at the CEPC.

Findings

Jet energy resolution of 3.5% in the barrel region for jets >60 GeV.

Jet angular resolution of 1% in the barrel region.

Jet response varies up to 8% depending on clustering algorithms and matching criteria.

Abstract

Jet reconstruction is critical for the precision measurement of Higgs boson properties and the electroweak observables at the CEPC. We analyze the jet energy and angular responses of benchmark 2- and 4-jet processes with fully simulated samples with the CEPC baseline detector geometry. We observe a relative resolution of 3.5$\%$ and 1$\%$ on the jet energy and angular measurement for jets in the detector barrel region ($|cos{\theta}| < 0.6$) with energy greater than 60 GeV. Meanwhile, the jet energy/angular scale can be controlled within 0.5/0.01$\%$. The differential dependences of the jet response on the jet direction and energy are extracted. We also analyze the impact on the jet responses induced by different jet clustering algorithms and matching criteria, which yields a relative difference of up to 8$\%$.